Mounting for rock drills



Q 3933- w. A. SMITH. $12., a AL 3,911,975

MOUNTING FOR ROCK DRI'LLS Filed Dec. 3, 1951 2 Sheets -Sheet l Ill IINIHTI HIHIIHHIHHI THEIR A TTORNEYZ' y 30, 1933- w. A. SMITH. SR., Er AL, 1,9113% MOUNTING FOR ROCK DRILLS Filed Dec. 3, 1931 2 Sheets-Sheet 2 "HIlll 'H IIIIII THEIHA TTORNEYI Patented May 30, 1933;

UNITED STATES PATENT OF FlCE WTLLIAM A. SMITH, 83., OF EASTON, PENNSYLVANIA, D WILLIAM A. SMITH, J 3., OF

PHILLIPSBURG, NEW JERSEY, ASSIGNORS TO ING-ERSOLL-RAND COMPANY, OF JER SEY CITY, JERSEY, A CORPORATION OF NEW JERSEY MOUNTING FOR ROCK DRILLS Application filed December 3, 1931. Serial No. 578,688.

' This invention relates to drilling mechanism, but more particularly to a mounting for rock drills of the percussive type.

One object of the invention is to enable the mounting to be cheaply manufactured and maintained.

Another object is to assure a rigid and simplified mounting which may be quickly and conveniently disposed and correctly retained with respect to the work. 7

Other objects will bein part obvious. and in part pointed out hereinafter.

In the accompanying drawings illustrating the invention and in which similar reference characters refer to similar parts,

Figure 1 is a side elevation partly. broken away of a mounting constructed in accordance with the practice of the invention and a rock drill supported by the mounting,

Figures 2 and 3 are transverse views taken through Figure l on the lines 22 and 3-3 looking in the direction indicated by the arrows, V

Figure 4 is a perspective view of a carriage for the rock drill,

Figure 5 is a side elevation of a braking device for the carriage,

Figure 6 is a plan view of the braking device, and

Figure 7 is a transverse view through Figure 5 on the line 7-7 looking in the direction indicated by the arrows.

Referring more particularly to the drawings, the mounting is designated in general by A and the rock drill which it supports with respectto the work, such as the rock B, is designated by C. I

The rock drill C may comprise the usual cylinder D, a back head E and a front head F and the headsFi and F may be conveniently secured to the cylinder D by side bOlts G. Within the cylinder D is a hammer piston H for delivering blows of impact against a drill steel J guided by the front head F and having a suitable cutting bit for drilling holes K in the rock B. The drill steel J may be provided with the usual collar L to limit the distance whichthe drill steel may extend into the front head F, and on the front head F is arranged a steel retainer O, the yoke P of which may partly encircle the drill steel J and lies forwardly of the collar L for preventing ejection of the drill steel J from the front head F.

The admission of pressure fluid into the The mounting constructed in accordance with the practice of the invention, and which is adapted to support the rock drill C, comprises a guide member R of structural shape, such as a T-bar, having the usual side flanges S and the depending flange T.

At one end of the guide member R is a bar or rod U which may be secured to the flange T by rivets or bolts V. The rod U extends into a drill hole K to support both the mounting A and the rock drill O in the correct position with respect to the work.

The rod U serves as the sole support for the drilling mechanism and has a series of notchesin its periphery to define transverse teeth W which engagethe wall of the hole K and thus prevent accidental withdrawal of the rod U'from the drill hole K.

Preferably a centralizer X of any well known type is disposed on the front end of the guide member R to maintain the front or free end of the drill steel J in approximate alignment with the rock drill C.

Disposed slidably on the flanges S is a carriage or cradle Y having a base Z where in are formed guideways b to receive the flanges S. At the front end of the carriage Y is a bearing 0 to support the front portion of the rock drill C, as for instance, at a point adjacent the rear end of the front head F. r V

The bearing 0 is provided with a pair of inwardly curved members'or hooks d which may conform substantially to the curvature of and to losely engage adjacent portions'of ly disposed lugs e on the front head F and through which the side bolt-s G extend. Near the rearward end of the carriage Y and above the base Z is a notch or groove 7 to receiveloosely an enlargement or lug g of the back head E for preventing relative longitudinal movement between the rock drill C and the carriage.

In certain positions of the drilling apparatus it is at times desirable that a slight braking effect be applied to the rock drill to prevent its too free movement on the guide member B. This is particularly true in such cases where the drilling mechanism is arranged in an inclined position. In order, therefore,'to retard the movement of the rock drill somewhat on the guide member R, the carriage Y is provided with a braking device designated in general by h. The braking device comprises a plate j which is secured to the side of the carriage by means of bolts 70 having nuts 0.

In the side of the carriage Y is a recess 10 wherein is disposed a braking shoe '9 preferably in the form of a channel member which seats or is disposed on a flange S;

Intermediate the ends of the plate j is a threaded aperture 1' for the reception of a screw 3 which acts against the brake shoe 9 for pressing said shoe against the flange S.

A lever t is disposed on the bolt 8 to enable said bolt to be conveniently manipulated, and in the lever t is a spring pressed plunger u having a tooth 'v on one end for engagement with notches w in the upper surface of the plate y'.

In order that an ample area of contact may be effected between the shoe 9 and the flange S the outer wall as of the shoe 9 is preferably curved outward y intermediate its ends in the direction of the screw 8 so that the wall will contact with the flange S at points near the ends of the wall as instead of principally at a point immediately adjacent the screw 8. I

Means are herein provided to enable the rock drill C to be moved longitudinally of the guide member R by the jar resulting upon reversal of the hammer piston H at the ends of its stroke. To this end the carriage Y is provided at its rear end with a bearing member y which may be secured to the carriage Y by means of bolts 2. The bearing member y has an aperture 2 therein to receive and guide a stem 3 of a link 4 which carries at its lowermost end, and on the opposite sides thereof, integral hooks 5 to engage the flanges S and to slide thereupon.

To the end that the link 4 may be conveniently adjusted to and held in positions for either causing the rock drill to move forwardly or rearwardly on the guide member R, the carriage Y is provided with a crank 6 journalled in the carriage and having a pin 7 arranged eccentrically thereon. The pin 7 is journalled in a head 8 to one end of which is secured a rod 9 which extends through an aperture 10 in the link 4. On opposite sides of the link 4, and disposed about the rod 9, are springs 11 and 12 which seat with their inner ends against the link l. The spring 11 disposed forwardly of'the link 1 acts with its opposite end against the head 8, while the spring 12,'which is arranged about the rear end of the rod 9, acts with its rear end against a nut 13 threaded on that end of the rod 9. The crank 6 may be provided with a suitable lever 14 to enable it to be conveniently rotated from one position to another. i v

Secured to theflange'T, as for instance at the rear end thereof and preferably immediately beneath the flanges S, are stop members 15, only one of which is shown in F igure 1, toact as an abutment for the link 4,

or more specifically the hooks 5, to trip the link to a neutral position as the drill C and the carriage Y approach the rear end of the guide member. The stop members 15-may be secured to the flange T by bolt 16.

In order to limit the distance which the rock drill C may travel in a-folrwardly directhe rock B, the rod U may be disposed therein to support both the mounting and the rock drill. The rock drill C may then be set in operation to drill another hole K, and

'with the link 4 inclined forwardly with its free or lower end in the manner illustrated in Figure 1, the rock drill together with the carriage will be carried forwardly in thedirection of the work upon each forward stroke of the hammer piston IL The hooks 5 will then frictionally'enga'ge the flanges S and retain the carriage and the drill-in:

the position to which they have been carried by the jar applied to the rock drill by the piston H at the forward stroke of the piston.

With the link 1 in engagement with the flanges and the rock drill and the carriage will be effectively held against rearward movement, such as might otherwise occur upon reversal of the piston H in the rear end of the cylinderD. The advancement of the drilling mechanism 'may continue in 'this manner until the front end of the carriage Y strikes the stop -member -17.; The link 1 may then be reversed by means of the crank 6.

With the hammer piston H thencontinuing its operation only the rearwardly directed blows of said hammer piston will be effective to shift the rock drill relatively to the guide member R. The rock drill, together with the carriage, will thereafter move only in a rearwardly direction on the guide member R and, as the drilling mechanism approaches the rearmost limiting position on the guide member, the link 4 will strike the stop member 15 and will thereby be moved to a neutral position, that is, to a position where the springs 11 and 12 will exert equal pressures on the link 4.

Whenever the rock drill advances towards the work at an unduly high rate of speed, as for instance when drilling soft material or when the drill steel encounters soft strata in the rock being drilled and either of which cases the drill hole would become rifled, the lever 25 may be actuated to eflect frictional engagement between the brake shoe g and the flange S. In this way the movement of the rock drill and the carriage may be retarded to a suflicient extent to assure a clean and smooth drillhole so that the drill steel may be readily retracted therefrom.

After the drill hole is completed the entire drilling mechanism may be withdrawn from the position which it occupied during such drilling operation and the rod U may then be inserted in the last hole drilled to support the drilling for a subsequent operation.

We claim:

A mounting for a rock drill, comprising a guide member of structural shape having a pair of flanges extending longitudinally thereof, a cradle having a plurality of bearing points to loosely receive and support the rock drill and being slidably guided by the flanges, a link supported by the cradle and having gripping elements thereon to frictionally engage the flanges for preventing recoil of the rock drill, manually operable means for shifting the link to diflerent gripping position relatively to the flanges, a brake shoe seated in the cradle and being slidable on one flange, and actuating means on the cradle to press the brake shoe into frictional engagement with the said flange.

In testimony whereof we have signed this specification.

WILLIAM A. SMITH, SR. WILLIAM A. SMITH, JR. 

